Superhero team-ups are meant to be fun, but when one of the biggest supervillains around shows up in front of you, demands an alliance, and then tells you that oh, by the way, he’s totally given up being a villain to take the place of Iron Man? Well, those team-ups are fraught with danger… or should be, at least.
Source: io9 – Doctor Doom Is Teaming Up With the Avengers—And Could Join Them for Good